Question 1157946
Long wording, simple description, maybe easiest to try to make a data table.

<pre>
MATERIAL              VARIABLE or EXPRESSIOn     PRICE       COST
milk choc                      m                 2.6        2.6m
dark choc                      d                 4.6        4.6d
dark with almonds            m+d                 5.3        5.3(m+d)
TOTAL                         50                          (50)(5.3)(m+d)
</pre>
You can form two equations in two unknowns, and solve.  (You can also use the "VARIABLES" sum equation to put the cost equation into a single variable and solve.)